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G700-U10 Smartphone
Maintenance Manual
10.4.12 Headset Circuit
Circuit Diagram
Figure 10-49 Headset circuit
Circuit Analysis
When a headset is inserted into the phone, pin 4 of the headset connector is pulled down, and
an interrupt AUX2_EINT_HP is generated. The MT6589 detects the interrupt, determining
that a headset has been inserted. After you press the key on the headset, EARBIAS outputs
periodical square waves. When EARBIAS is at high level, the MT6589 detects the ACCDET
pin. If the pin is detected as low, the chip determines that the key has been pressed.
Issue 1.0 (2013-07-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
10 Circuit and Failure Analysis
75
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